Loss per Share (Weighted Average Shares Outstanding) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net Loss Attributable to Weatherford	$ (116)	$ (966)
Weighted Average Shares Outstanding, Basic and Diluted (in shares)	70	70
Loss Per Share, Basic & Diluted (in dollars per share)	$ (1.66)	$ (13.80)